Is there a way to go around the problem with units covering areas? Can I remove the units temporarily from view in order to see the area beneath them? How can I move a unit into a city if other units, friendly or enemy, are covering the city symbol physically? This is getting rather annoying.

there is a game option that means at the end of the turn all the separate stacks in a region appear in a single pile - this helps see the underlying terrain (you can still cycle between the stacks to give new orders|).

I wouldn't enter cities/fortresses unless I really needed to. The risk of being trapped is real and its very hard to break out of a siege due to the frontage etc rules

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AARs: WiTW: Once Upon a Time (somewhere)in the West; Fischia il vento; (oh) For a few Panzers More; XXX Corps Diary; Infamy, Infamy! Others at AGEOD PoN: A clear bright sun